import fs from 'fs/promises'
import path from 'path'
import { TextDecoder } from 'util'
import { PACKAGE_JSON_OPTIONS_KEY } from '../constant'
import { OptionNotFoundError, OptionSyntaxError } from '../error'
import type { CheckerOptions } from '../type'

const validateOptions = (options: any): CheckerOptions => {
    if (!options || typeof options !== 'object') {
        throw new OptionNotFoundError()
    }

    const o = options as Partial<CheckerOptions>

    if (!Array.isArray(o?.includes)) {
        throw new OptionSyntaxError('Please make sure you have included single version dependencies in option.')
    }

    if (o?.failOnCI !== undefined && typeof o.failOnCI !== 'boolean') {
        throw new OptionSyntaxError('Please use boolean for failedOnCI option')
    }

    return options as CheckerOptions
}

export const parseOptions = async (projectRoot: string): Promise<CheckerOptions> => {
    const packageJsonfile = await fs.readFile(path.join(projectRoot, 'package.json'))
    // @see https://github.dev/sindresorhus/load-json-file
    const packageJSON = JSON.parse(new TextDecoder().decode(packageJsonfile))

    const options = validateOptions((packageJSON as any)?.[PACKAGE_JSON_OPTIONS_KEY])

    if (options.failOnCI === undefined) {
        options.failOnCI = true
    }

    return options
}